Planes didn't sound amazing when I first heard of it (everyone suggested it was merely a clone of "Cars") and they were pretty close to the mark. Problem was Cars wasn't bad, but it was far from the best Pixar had offered up animation wise (in fact most feel it's one of their weaker products esp with Toy Story standing out as one of their best)
Despite the fact Pixar is now owned by Disney, this production is made by "DisneyToon Studios" which is a different group of people.
Story wise it's very predictable (and honestly not as good as Cars) it just feels like a lower level re-run of that production. The animation is reasonably decent, though it doesn't have the polish and shine one would expect from a Pixar production. Honestly the humour and fun isn't really here either (it's not really funny, bar a few moments)
Cast wise, a bit of a mixed bag I'm not crazy about Dane Cook (Dusty Crophopper) though there are a few well known people such as Teri Hatcher (Dottie), Val Kilmer (Bravo) but Danny Mann (Sparky) is an experienced voice over actor and he's done voices for many animations. Not quite the top tier voice acting I'd have hoped for, and it's hard to attach to many of the characters in the film (not really much variation in appearance unlike Cars) The biggest issue is you've just seen it all before, and in stronger films so this will probably not go down well with adult film viewers (I got bored quite quickly)
It's an ok way to kill and hour and a half and kids aged 5-8 will probably like it. Older ones might find it a bit thin and nowhere near as funny as one would have hoped. My Son watched it and thought it was "ok" but no more than that. I'm going on his rating here hence the 3 stars. Worth a look if you are desperate for more animation films to add to your collection, but there are many more that should be far higher up your buy list.